US20220189856A1 - Die attachment for semiconductor device packaging and method therefor - Google Patents
Die attachment for semiconductor device packaging and method therefor Download PDFInfo
- Publication number
- US20220189856A1 US20220189856A1 US17/118,865 US202017118865A US2022189856A1 US 20220189856 A1 US20220189856 A1 US 20220189856A1 US 202017118865 A US202017118865 A US 202017118865A US 2022189856 A1 US2022189856 A1 US 2022189856A1
- Authority
- US
- United States
- Prior art keywords
- die
- semiconductor
- cavity
- paddle
- die paddle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000004065 semiconductor Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004806 packaging method and process Methods 0.000 title description 4
- 239000000956 alloy Substances 0.000 claims abstract description 35
- 229910000679 solder Inorganic materials 0.000 claims abstract description 31
- 150000001875 compounds Chemical class 0.000 claims abstract description 16
- 238000000465 moulding Methods 0.000 claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 18
- 238000007607 die coating method Methods 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 238000007747 plating Methods 0.000 claims description 8
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 5
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 239000008393 encapsulating agent Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910002601 GaN Inorganic materials 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920006336 epoxy molding compound Polymers 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000012913 prioritisation Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
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Definitions
- This disclosure relates generally to semiconductor devices, and more specifically, to die attachment for semiconductor device packaging.
- Semiconductor devices are often found in a large spectrum of electronic products—from sewing machines to washing machines, from automobiles to cellular telephones, and so on. Many of these semiconductor devices are sensitive to temperature, pressure, moisture and other environmental conditions. Such sensitives often affect the performance and reliability of those semiconductor devices. However, as technology progresses, semiconductor manufacturing continues to seek ways to improve performance and reliability in these semiconductor devices.
- FIG. 1 illustrates, in a simplified plan view, a leadframe for an example semiconductor device at a stage of manufacture in accordance with an embodiment.
- FIG. 2 through FIG. 8 illustrate, in simplified cross-sectional views, the example semiconductor device at stages of manufacture in accordance with an embodiment.
- a die attachment method and structure for semiconductor device packaging suitable for package types with solder alloy die attach material.
- a die paddle of a package leadframe is formed having a cavity. The sidewalls and bottom surface of the cavity are selectively plated with a solder alloy material.
- a semiconductor die is attached at the bottom surface of the cavity during a thermal cycle. During the thermal cycle, the die paddle is heated to cause the solder alloy to reflow. As the solder reflows, a superior void-free die attachment is formed. By eliminating voids in the die attachment materials, especially for power device packages, higher reliability, performance, and manufacturing yields can be realized.
- FIG. 1 illustrates, in a simplified plan view, a leadframe 116 for an example semiconductor device 100 at a stage of manufacture in accordance with an embodiment.
- semiconductor device 100 includes a leadframe 116 .
- the leadframe 116 includes a die paddle 102 , a cavity 104 formed in the die paddle, a plurality of conductive leads 106 , dam bars 108 interconnected to the plurality of leads 106 and side rails 112 , and tie bars 110 extending from side rails 112 .
- the leadframe 116 may be formed from any suitable electrically conductive materials, such as copper, silver, nickel, aluminum, or iron, or alloys thereof, for example.
- the conductive metal may be bare, partially plated, or plated with another metal or an alloy such as iron/nickel alloy, silver, gold, copper, or the like.
- the leadframe 116 may be characterized as a power device leadframe such as heatsink small outline package (HSOP) leadframe.
- HSOP heatsink small outline package
- Other power device leadframes are anticipated such as dual in-line bent single in-line (DIL-bent-SIL or DBS) package leadframes, for example.
- a dashed outline label 114 indicates an outer perimeter location of an encapsulant at a subsequent stage of manufacture.
- Cross-sectional views of semiconductor device 100 taken along line A-A are shown in example stages of manufacture depicted in FIG. 2 through FIG. 8 .
- the die paddle 102 may be formed having any suitable shape or size.
- the cavity 104 formed in the die paddle 102 is configured for an attachment of a semiconductor die.
- the cavity 104 may be formed by way of a punch process or by way of an etch process.
- the die paddle 102 is formed separately and connected to the leadframe 116 by way of tie bar welds.
- the plurality of leads 106 are configured and arranged to couple electrical signals between external (e.g., printed circuit board) locations of a mounted semiconductor device and internal locations such as bond pads on a semiconductor die attached to the die paddle 102 , for example.
- FIG. 2 illustrates, in a simplified cross-sectional view, the example semiconductor device 100 taken along line A-A at a stage of manufacture in accordance with an embodiment.
- the semiconductor device 100 depicted in FIG. 2 includes the conductive leads 106 and the die paddle 102 .
- the cavity 104 is formed in the die paddle 102 .
- the cavity 104 includes sidewalls 202 and bottom 204 surfaces.
- the cavity 104 may be formed by way of a punch process or by way of an etch process.
- the die paddle 102 is further configured as a heat spreader or heatsink configured for dissipation of heat generated from an attached semiconductor die. For example, this configuration of the die paddle 102 may be advantageous for power devices which generate a significant amount of heat.
- FIG. 3 illustrates, in a simplified cross-sectional view, the example semiconductor device 100 taken along line A-A at a subsequent stage of manufacture in accordance with an embodiment.
- the semiconductor device 100 depicted in FIG. 3 includes the conductive leads 106 and the die paddle 102 with the cavity 104 having plated surfaces.
- the sidewall and bottom surfaces of the cavity 104 are selectively plated with a solder alloy.
- approximately the entire sidewall and bottom surfaces of the cavity are plated with the solder alloy.
- the solder alloy may be formed from materials such as tin, lead, copper, silver, gold, zinc, nickel, and bismuth materials for example.
- FIG. 4 illustrates, in a simplified cross-sectional view, the example semiconductor device 100 taken along line A-A at a subsequent stage of manufacture in accordance with an embodiment.
- the semiconductor device 100 depicted in FIG. 4 includes the conductive leads 106 and the die paddle 102 with the cavity 104 having reflowed plated surfaces.
- the die paddle 102 is subjected to a thermal cycle whereby heat applied to the die paddle 102 causes the solder alloy on the surfaces of the cavity 104 to wet and reflow.
- the reflowed solder alloy 402 remains on a lower portion of the sidewall surfaces while an upper portion of the sidewall surfaces is substantially clear of the solder alloy.
- FIG. 5 illustrates, in a simplified cross-sectional view, the example semiconductor device 100 taken along line A-A at a subsequent stage of manufacture in accordance with an embodiment.
- the semiconductor device 100 depicted in FIG. 5 includes a semiconductor die 502 attached to the die paddle 102 by way of the reflowed solder alloy 402 .
- a bottom surface of the semiconductor die 502 is attached to the bottom of the cavity of the die paddle 102 by way of the reflowed solder alloy 402 .
- the reflowed solder alloy 402 is in a molten state allowing for attachment of the semiconductor die 502 to the bottom surface of the cavity.
- the semiconductor die 502 may be formed from any suitable semiconductor material, such as silicon, germanium, gallium arsenide, gallium nitride and the like.
- Semiconductor die 502 may include circuitry such as high voltage circuits capable of generating heat.
- FIG. 6 illustrates, in a simplified cross-sectional view, the example semiconductor device 100 taken along line A-A at a subsequent stage of manufacture in accordance with an embodiment.
- the semiconductor device 100 depicted in FIG. 6 includes the semiconductor die 502 attached to the die paddle 102 and interconnected to the conductive leads 106 by way of bond wires 602 .
- the semiconductor die 502 includes bond pads 504 formed at a top surface.
- Bond wire 602 have a first end connected to the die pads 504 on the semiconductor die 502 and a second end connected to the conductive leads 106 .
- the bond wires 602 may be formed from a suitable metal material such as copper, silver, gold, or aluminum, for example.
- FIG. 7 illustrates, in a simplified cross-sectional view, the example semiconductor device 100 taken along line A-A at a subsequent stage of manufacture in accordance with an embodiment.
- the semiconductor device 100 depicted in FIG. 7 includes a die coating 702 formed over the semiconductor die 502 after the wire bonding stage depicted in FIG. 6 .
- the die coating 702 is applied to the top surface of the semiconductor die 502 using known methods and techniques.
- the die coating 702 may be formed from a silicone gel or polyimide material, for example.
- the die coating 702 may serve to substantially isolate the top surface of the semiconductor die 502 from a molding compound encapsulant formed in a subsequent stage, thus minimizing stress on the semiconductor die 502 and improving reliability.
- FIG. 8 illustrates, in a simplified cross-sectional view, the example semiconductor device 100 taken along line A-A at a subsequent stage of manufacture in accordance with an embodiment.
- the semiconductor device 100 depicted in FIG. 8 includes an encapsulant 802 encapsulating portions of the semiconductor die 502 , die paddle 102 , and conductive leads 106 .
- the encapsulant 802 may be an epoxy molding compound dispensed during an injection molding encapsulation operation, for example.
- a bottom surface of the die paddle 102 may remain exposed after encapsulating with the encapsulant 804 . For example, with the bottom surface of the die paddle 102 exposed, connection to an external heatsink or other heat dissipation structure is facilitated.
- exposed portions of the conductive leads 106 and bottom surface of the die paddle 102 are plated with a conductive material.
- the exposed portions of the conductive leads 106 and bottom surface of the die paddle 102 may be electroplated with a tin alloy material to facilitate solder adhesion.
- the semiconductor device 100 may be trimmed and formed to singulate the device and to shape the conductive leads in a manner suitable for attachment to a printed circuit board.
- a method including forming a package leadframe, the package leadframe including leads and a die paddle; forming a cavity in the die paddle; plating sidewall and bottom surfaces of the cavity with a solder alloy material; attaching a semiconductor die to the bottom surface of the cavity by way of a thermal cycle; and encapsulating with a molding compound the semiconductor die, a portion of the leads, and a portion of the die paddle.
- the method may further include connecting a die pad on the semiconductor die with a lead of the package leadframe by way of a bond wire.
- the method may further include applying a die coating material to a top surface of the semiconductor die before encapsulating with the molding compound.
- the thermal cycle may include heating the die paddle sufficient to reflow the solder alloy.
- the leads and the die paddle may be formed from a copper or copper alloy material.
- the die paddle may be configured to dissipate heat generated by the semiconductor die.
- the method may further include after encapsulating with the molding compound, plating exposed surfaces of the leadframe leads and the die paddle with a tin material.
- the package leadframe may be characterized as a heatsink small outline package (HSOP) leadframe.
- a semiconductor device including a package leadframe having a plurality of conductive leads and a die paddle; a cavity formed in the die paddle, the cavity having sidewall and bottom surfaces; a solder alloy formed on a portion of the sidewall surfaces and on the bottom surface of the cavity; a semiconductor die attached to the bottom surface of the cavity by way of the solder alloy; and a molding compound encapsulating the semiconductor die, a portion of the conductive leads, and a portion of the die paddle.
- the die paddle may be configured to dissipate heat generated by the semiconductor die.
- the semiconductor device may further include a die coating material applied to a top surface of the semiconductor die.
- the leads and the die paddle may be formed from a copper or copper alloy material.
- the semiconductor device may further include a metal material plated on exposed surfaces of the plurality of conductive leads and the die paddle.
- the semiconductor device may further include a bond wire having a first end connected to a die pad on the semiconductor die and a second end connected to a lead of the plurality of conductive leads.
- the package leadframe may be characterized as a heatsink small outline package (HSOP) leadframe.
- a method including providing a package leadframe including a plurality of conductive leads and a die paddle, the die paddle having a cavity formed in a top surface; plating sidewall and bottom surfaces of the cavity with a solder alloy material; attaching a semiconductor die to the bottom surface of the cavity while heating the die paddle to reflow the solder alloy; and encapsulating with a molding compound the semiconductor die, a portion of the leads, and a portion of the die paddle.
- the method may further include connecting by way of a bond wire a die pad on the semiconductor die with a lead of the plurality of conductive leads.
- the method may further include applying a die coating material to a top surface of the semiconductor die before encapsulating with the molding compound.
- the method may further include after encapsulating with the molding compound, plating exposed surfaces of the plurality of conductive leads and the die paddle with a tin material.
- the die paddle may be configured to dissipate heat generated by the semiconductor die.
- a die attachment method and structure for semiconductor device packaging suitable for package types with solder alloy die attach material.
- a die paddle of a package leadframe is formed having a cavity. The sidewalls and bottom surface of the cavity are selectively plated with a solder alloy material.
- a semiconductor die is attached at the bottom surface of the cavity during a thermal cycle. During the thermal cycle, the die paddle is heated to cause the solder alloy to reflow. As the solder reflows, a superior void-free die attachment is formed. By eliminating voids in the die attachment materials, especially for power device packages, higher reliability, performance, and manufacturing yields can be realized.
Abstract
Description
- This disclosure relates generally to semiconductor devices, and more specifically, to die attachment for semiconductor device packaging.
- Semiconductor devices are often found in a large spectrum of electronic products—from sewing machines to washing machines, from automobiles to cellular telephones, and so on. Many of these semiconductor devices are sensitive to temperature, pressure, moisture and other environmental conditions. Such sensitives often affect the performance and reliability of those semiconductor devices. However, as technology progresses, semiconductor manufacturing continues to seek ways to improve performance and reliability in these semiconductor devices.
- The present invention is illustrated by way of example and is not limited by the accompanying figures, in which like references indicate similar elements. Elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale.
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FIG. 1 illustrates, in a simplified plan view, a leadframe for an example semiconductor device at a stage of manufacture in accordance with an embodiment. -
FIG. 2 throughFIG. 8 illustrate, in simplified cross-sectional views, the example semiconductor device at stages of manufacture in accordance with an embodiment. - Generally, there is provided, a die attachment method and structure for semiconductor device packaging suitable for package types with solder alloy die attach material. A die paddle of a package leadframe is formed having a cavity. The sidewalls and bottom surface of the cavity are selectively plated with a solder alloy material. A semiconductor die is attached at the bottom surface of the cavity during a thermal cycle. During the thermal cycle, the die paddle is heated to cause the solder alloy to reflow. As the solder reflows, a superior void-free die attachment is formed. By eliminating voids in the die attachment materials, especially for power device packages, higher reliability, performance, and manufacturing yields can be realized.
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FIG. 1 illustrates, in a simplified plan view, aleadframe 116 for anexample semiconductor device 100 at a stage of manufacture in accordance with an embodiment. At this stage,semiconductor device 100 includes aleadframe 116. Theleadframe 116 includes adie paddle 102, acavity 104 formed in the die paddle, a plurality ofconductive leads 106,dam bars 108 interconnected to the plurality ofleads 106 andside rails 112, andtie bars 110 extending fromside rails 112. Theleadframe 116 may be formed from any suitable electrically conductive materials, such as copper, silver, nickel, aluminum, or iron, or alloys thereof, for example. The conductive metal may be bare, partially plated, or plated with another metal or an alloy such as iron/nickel alloy, silver, gold, copper, or the like. In this embodiment, theleadframe 116 may be characterized as a power device leadframe such as heatsink small outline package (HSOP) leadframe. Other power device leadframes are anticipated such as dual in-line bent single in-line (DIL-bent-SIL or DBS) package leadframes, for example. A dashedoutline label 114 indicates an outer perimeter location of an encapsulant at a subsequent stage of manufacture. Cross-sectional views ofsemiconductor device 100 taken along line A-A are shown in example stages of manufacture depicted inFIG. 2 throughFIG. 8 . - The die
paddle 102 may be formed having any suitable shape or size. Thecavity 104 formed in thedie paddle 102 is configured for an attachment of a semiconductor die. Thecavity 104 may be formed by way of a punch process or by way of an etch process. In this embodiment, thedie paddle 102 is formed separately and connected to theleadframe 116 by way of tie bar welds. The plurality ofleads 106 are configured and arranged to couple electrical signals between external (e.g., printed circuit board) locations of a mounted semiconductor device and internal locations such as bond pads on a semiconductor die attached to thedie paddle 102, for example. -
FIG. 2 illustrates, in a simplified cross-sectional view, theexample semiconductor device 100 taken along line A-A at a stage of manufacture in accordance with an embodiment. Thesemiconductor device 100 depicted inFIG. 2 includes theconductive leads 106 and thedie paddle 102. At this stage, thecavity 104 is formed in the diepaddle 102. Thecavity 104 includessidewalls 202 andbottom 204 surfaces. Thecavity 104 may be formed by way of a punch process or by way of an etch process. In some embodiments, thedie paddle 102 is further configured as a heat spreader or heatsink configured for dissipation of heat generated from an attached semiconductor die. For example, this configuration of thedie paddle 102 may be advantageous for power devices which generate a significant amount of heat. -
FIG. 3 illustrates, in a simplified cross-sectional view, theexample semiconductor device 100 taken along line A-A at a subsequent stage of manufacture in accordance with an embodiment. At this stage, thesemiconductor device 100 depicted inFIG. 3 includes theconductive leads 106 and thedie paddle 102 with thecavity 104 having plated surfaces. The sidewall and bottom surfaces of thecavity 104 are selectively plated with a solder alloy. In this embodiment, approximately the entire sidewall and bottom surfaces of the cavity are plated with the solder alloy. The solder alloy may be formed from materials such as tin, lead, copper, silver, gold, zinc, nickel, and bismuth materials for example. -
FIG. 4 illustrates, in a simplified cross-sectional view, theexample semiconductor device 100 taken along line A-A at a subsequent stage of manufacture in accordance with an embodiment. At this stage, thesemiconductor device 100 depicted inFIG. 4 includes theconductive leads 106 and thedie paddle 102 with thecavity 104 having reflowed plated surfaces. Thedie paddle 102 is subjected to a thermal cycle whereby heat applied to thedie paddle 102 causes the solder alloy on the surfaces of thecavity 104 to wet and reflow. The reflowedsolder alloy 402 remains on a lower portion of the sidewall surfaces while an upper portion of the sidewall surfaces is substantially clear of the solder alloy. -
FIG. 5 illustrates, in a simplified cross-sectional view, theexample semiconductor device 100 taken along line A-A at a subsequent stage of manufacture in accordance with an embodiment. At this stage, thesemiconductor device 100 depicted inFIG. 5 includes asemiconductor die 502 attached to thedie paddle 102 by way of the reflowedsolder alloy 402. A bottom surface of thesemiconductor die 502 is attached to the bottom of the cavity of thedie paddle 102 by way of the reflowedsolder alloy 402. For example, during the thermal cycle of the stage depicted inFIG. 4 or a subsequent thermal cycle, the reflowedsolder alloy 402 is in a molten state allowing for attachment of thesemiconductor die 502 to the bottom surface of the cavity. The semiconductor die 502 may be formed from any suitable semiconductor material, such as silicon, germanium, gallium arsenide, gallium nitride and the like. Semiconductor die 502 may include circuitry such as high voltage circuits capable of generating heat. -
FIG. 6 illustrates, in a simplified cross-sectional view, theexample semiconductor device 100 taken along line A-A at a subsequent stage of manufacture in accordance with an embodiment. At this stage, thesemiconductor device 100 depicted inFIG. 6 includes thesemiconductor die 502 attached to thedie paddle 102 and interconnected to theconductive leads 106 by way ofbond wires 602. The semiconductor die 502 includesbond pads 504 formed at a top surface.Bond wire 602 have a first end connected to thedie pads 504 on the semiconductor die 502 and a second end connected to theconductive leads 106. Thebond wires 602 may be formed from a suitable metal material such as copper, silver, gold, or aluminum, for example. -
FIG. 7 illustrates, in a simplified cross-sectional view, theexample semiconductor device 100 taken along line A-A at a subsequent stage of manufacture in accordance with an embodiment. At this stage, thesemiconductor device 100 depicted inFIG. 7 includes adie coating 702 formed over thesemiconductor die 502 after the wire bonding stage depicted inFIG. 6 . The diecoating 702 is applied to the top surface of the semiconductor die 502 using known methods and techniques. Thedie coating 702 may be formed from a silicone gel or polyimide material, for example. In this embodiment, thedie coating 702 may serve to substantially isolate the top surface of the semiconductor die 502 from a molding compound encapsulant formed in a subsequent stage, thus minimizing stress on the semiconductor die 502 and improving reliability. -
FIG. 8 illustrates, in a simplified cross-sectional view, theexample semiconductor device 100 taken along line A-A at a subsequent stage of manufacture in accordance with an embodiment. At this stage, thesemiconductor device 100 depicted inFIG. 8 includes anencapsulant 802 encapsulating portions of the semiconductor die 502, diepaddle 102, and conductive leads 106. Theencapsulant 802 may be an epoxy molding compound dispensed during an injection molding encapsulation operation, for example. In this embodiment, a bottom surface of thedie paddle 102 may remain exposed after encapsulating with theencapsulant 804. For example, with the bottom surface of thedie paddle 102 exposed, connection to an external heatsink or other heat dissipation structure is facilitated. After encapsulating portions of the semiconductor die 502, diepaddle 102, and conductive leads 106 with theencapsulant 804, exposed portions of the conductive leads 106 and bottom surface of thedie paddle 102 are plated with a conductive material. For example, the exposed portions of the conductive leads 106 and bottom surface of thedie paddle 102 may be electroplated with a tin alloy material to facilitate solder adhesion. In a subsequent stage, thesemiconductor device 100 may be trimmed and formed to singulate the device and to shape the conductive leads in a manner suitable for attachment to a printed circuit board. - Generally, there is provided, a method including forming a package leadframe, the package leadframe including leads and a die paddle; forming a cavity in the die paddle; plating sidewall and bottom surfaces of the cavity with a solder alloy material; attaching a semiconductor die to the bottom surface of the cavity by way of a thermal cycle; and encapsulating with a molding compound the semiconductor die, a portion of the leads, and a portion of the die paddle. The method may further include connecting a die pad on the semiconductor die with a lead of the package leadframe by way of a bond wire. The method may further include applying a die coating material to a top surface of the semiconductor die before encapsulating with the molding compound. The thermal cycle may include heating the die paddle sufficient to reflow the solder alloy. The leads and the die paddle may be formed from a copper or copper alloy material. The die paddle may be configured to dissipate heat generated by the semiconductor die. The method may further include after encapsulating with the molding compound, plating exposed surfaces of the leadframe leads and the die paddle with a tin material. The package leadframe may be characterized as a heatsink small outline package (HSOP) leadframe.
- In another embodiment, there is provided, a semiconductor device including a package leadframe having a plurality of conductive leads and a die paddle; a cavity formed in the die paddle, the cavity having sidewall and bottom surfaces; a solder alloy formed on a portion of the sidewall surfaces and on the bottom surface of the cavity; a semiconductor die attached to the bottom surface of the cavity by way of the solder alloy; and a molding compound encapsulating the semiconductor die, a portion of the conductive leads, and a portion of the die paddle. The die paddle may be configured to dissipate heat generated by the semiconductor die. The semiconductor device may further include a die coating material applied to a top surface of the semiconductor die. The leads and the die paddle may be formed from a copper or copper alloy material. The semiconductor device may further include a metal material plated on exposed surfaces of the plurality of conductive leads and the die paddle. The semiconductor device may further include a bond wire having a first end connected to a die pad on the semiconductor die and a second end connected to a lead of the plurality of conductive leads. The package leadframe may be characterized as a heatsink small outline package (HSOP) leadframe.
- In yet another embodiment, there is provided, a method including providing a package leadframe including a plurality of conductive leads and a die paddle, the die paddle having a cavity formed in a top surface; plating sidewall and bottom surfaces of the cavity with a solder alloy material; attaching a semiconductor die to the bottom surface of the cavity while heating the die paddle to reflow the solder alloy; and encapsulating with a molding compound the semiconductor die, a portion of the leads, and a portion of the die paddle. The method may further include connecting by way of a bond wire a die pad on the semiconductor die with a lead of the plurality of conductive leads. The method may further include applying a die coating material to a top surface of the semiconductor die before encapsulating with the molding compound. The method may further include after encapsulating with the molding compound, plating exposed surfaces of the plurality of conductive leads and the die paddle with a tin material. The die paddle may be configured to dissipate heat generated by the semiconductor die.
- By now it should be appreciated that there has been provided, a die attachment method and structure for semiconductor device packaging suitable for package types with solder alloy die attach material. A die paddle of a package leadframe is formed having a cavity. The sidewalls and bottom surface of the cavity are selectively plated with a solder alloy material. A semiconductor die is attached at the bottom surface of the cavity during a thermal cycle. During the thermal cycle, the die paddle is heated to cause the solder alloy to reflow. As the solder reflows, a superior void-free die attachment is formed. By eliminating voids in the die attachment materials, especially for power device packages, higher reliability, performance, and manufacturing yields can be realized.
- Although the invention is described herein with reference to specific embodiments, various modifications and changes can be made without departing from the scope of the present invention as set forth in the claims below. Accordingly, the specification and figures are to be regarded in an illustrative rather than a restrictive sense, and all such modifications are intended to be included within the scope of the present invention. Any benefits, advantages, or solutions to problems that are described herein with regard to specific embodiments are not intended to be construed as a critical, required, or essential feature or element of any or all the claims.
- Furthermore, the terms “a” or “an,” as used herein, are defined as one or more than one. Also, the use of introductory phrases such as “at least one” and “one or more” in the claims should not be construed to imply that the introduction of another claim element by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim element to inventions containing only one such element, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an.” The same holds true for the use of definite articles.
- Unless stated otherwise, terms such as “first” and “second” are used to arbitrarily distinguish between the elements such terms describe. Thus, these terms are not necessarily intended to indicate temporal or other prioritization of such elements.
Claims (20)
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US20230063262A1 (en) * | 2021-08-31 | 2023-03-02 | Texas Instruments Incorporated | Die pad recesses |
US20230245928A1 (en) * | 2022-02-01 | 2023-08-03 | Texas Instruments Incorporated | Temperature-based semiconductor wafer singulation |
EP4345892A1 (en) * | 2022-09-29 | 2024-04-03 | NXP USA, Inc. | Semiconductor device with resin bleed control structure and method therefor |
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US20140061669A1 (en) * | 2012-09-04 | 2014-03-06 | Infineon Technologies Ag | Chip package and a method for manufacturing a chip package |
US20200105706A1 (en) * | 2018-09-28 | 2020-04-02 | Semiconductor Components Industries, Llc | Semiconductor device assemblies including spacer with embedded semiconductor die |
US20230063262A1 (en) * | 2021-08-31 | 2023-03-02 | Texas Instruments Incorporated | Die pad recesses |
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US20140061669A1 (en) * | 2012-09-04 | 2014-03-06 | Infineon Technologies Ag | Chip package and a method for manufacturing a chip package |
US20200105706A1 (en) * | 2018-09-28 | 2020-04-02 | Semiconductor Components Industries, Llc | Semiconductor device assemblies including spacer with embedded semiconductor die |
US20230063262A1 (en) * | 2021-08-31 | 2023-03-02 | Texas Instruments Incorporated | Die pad recesses |
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Publication number | Priority date | Publication date | Assignee | Title |
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US20230063262A1 (en) * | 2021-08-31 | 2023-03-02 | Texas Instruments Incorporated | Die pad recesses |
US11862538B2 (en) * | 2021-08-31 | 2024-01-02 | Texas Instruments Incorporated | Semiconductor die mounted in a recess of die pad |
US20230245928A1 (en) * | 2022-02-01 | 2023-08-03 | Texas Instruments Incorporated | Temperature-based semiconductor wafer singulation |
EP4345892A1 (en) * | 2022-09-29 | 2024-04-03 | NXP USA, Inc. | Semiconductor device with resin bleed control structure and method therefor |
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